recently I've built a machine based on Intel DH55HC MB and Core i5-680 processor. I've tried to use a pair of Mushkin Silverline DIMM's (2x4Gb) on this combo and it only booted with one DIMM installed to channel B. On another MB (some Asus with 3420 chipset) togther with a Core i7-860 the Mushkin DIMM's run without a problem. Later I used a second pair of DIMM's from the list of tested memory (G. Skill Ripjaws Kit 2x2Gb). This memory only runs with one or both DIMM's placed on channel B. If I use them in any other configuration the MB either powers up and does not POST nor beep at all, or it does repeatedly cylce power without POST or beep.

Is there anyone who got this particular MB to work in a standard dual channel memory configuration?

I've already ordered another mainboard to try out the CPU and RAM there. The weird thing is that channel B works perfectly and as soon as I put a module into one of the channel slots the board doesn't come up at all.

I can't see why the memory shouldn't work if its type is stated to be 10666. The correct (JEDEC) name would be PC3-10600. Both modules I tried out are running on standard JEDEC timings CL9-9-9-24 on the I7 system without a problem. Both module sets do not work in a two channel configuration but only when put into a single memory channel.

I've tested it with almost all combinations. The standard one with two identical DIMM's in the blue slots doesn't work for any DIMM's I have. Putting both of them into the black slots doesn't differ much. In both cases the board doesn't beep or POST. If I put one or both modules on only channel B (black and/or blue slot) the board does the POST and it is running without a problem under Windows 7 for about 20 hours up to now. As soon as a DIMM is placed on one of the channel A slots (black or blue) the board ceases to boot.

Both kits run at standard 1.5V, I double checked that on the other system. Both were configured there with 667 MHz and CL9-9-9-24 which is the standard JEDEC profile for DDR1333. What bothers me is that the system runs rock solid with only on channel populated. Usually I'd assume a defective board or CPU would cause the board to not run at all or become pretty unstable.

Finally I got a new board to try CPU and memory on. All possible combinations work on the new one, the old one still does not work if a DIMM is sitting in channel A. So it seems that only DIMM channel A on the MB has a defect. I'll send it back and try the replacement as soon as I get it.